<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Hello</title>
    <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/babel-standalone@6.26.0/babel.js"></script>
  </head>
  <body>
    <div id="app-root"></div>
    <script src="app.js" type="text/babel"></script>
  </body>
</html>